A device and method for realizing reuse of printing and dyeing wastewater and recovery of dyestuffs

Abstract

The invention relates to a printing and dyeing wastewater reuse, and particularly relates to a device and a method for printing and dyeing wastewater water-soluble dye recovery on the basis of a membrane separation technology. The device comprises a raw water booster pump, a self-cleaning filter, a precise filter, an ultrafiltration membrane assembly, an ultrafiltration backwash pump, an ultrafiltration water tank, a high-pressure pump, a nanofiltration membrane assembly, and a reducer and scale inhibitor pouring system which are communicated with a wastewater collection pool. The method comprises the steps of draining the dyed wastewater to the wastewater collection pool and pumping the dyed wastewater in the self-cleaning filter through the raw water booster pump to remove large-particle suspended matters and impurities, then entering the wastewater into the precise filter to remove the remainder suspended matters, then entering the wastewater into an ultrafiltration membrane to remove bacteria, colloids and macromolecular organic compounds, finally pumping the wastewater in a nanofiltration membrane device through the high-pressure pump to remove micromolecular organic compounds and divalent ions, thereby producing high-quality reclaimed water and simultaneously intercepting and recovering most of activated dye molecules.

Description

technical field [0001] The invention belongs to the technical field of waste treatment and recycling, and relates to recycling of printing and dyeing wastewater, in particular to a device and method for recycling water-soluble dyes from dyeing wastewater based on membrane separation technology. Background technique [0002] The printing and dyeing industry is a large discharge of industrial wastewater in my country, accounting for 7.5% of the national industrial wastewater statistical discharge. Printing and dyeing wastewater has a large amount of water, complex water quality, high content of organic pollutants, large chroma, and poor biodegradability. It is a type of industry that is difficult to treat. waste water. The direct discharge of printing and dyeing wastewater will not only pollute the environment, but also a waste of water resources. How to effectively use the existing wastewater resources and turn waste into treasure is an effective way to deal with environmental...

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the disadvantages of printing and dyeing wastewater mainly containing water-soluble dyes such as reactive dyes and direct dyes, which are difficult to treat, high in cost, complicated in operation, difficult in biological decolorization and easy to form secondary pollution, and provides a dyeing wastewater pollutant removal method. Device and method thereof with high efficiency, obvious decolorization effect, capable of realizing both waste water reuse and separation and recovery of water-soluble dyes

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